There’s a popular trend in Japan and Korea: dating by blood type. Rather than asking a potential partner for their star sign, daters might ask their suitors whether they’re AB+. The idea behind it is that (supposedly) your blood type affects your personality, making you more or less compatible to certain other blood types.

While it has as much scientific basis as a game of MASH (You will live in a mansion, marry Nate, have 6 kids and drive a Ferrari…), it’s fun to have a look.

Woman + Man

A + A = stable love and devotion
A + B = tough for the woman
A + O = ideal couple
A + AB = stable union with the man leading

B + A = argumentative
B + B = to each their own
B + O = harmonious couple
B + AB = man is cool; woman is hot

O + A = the woman must compromise a little more than the man
O + B = in sync couple
O + O = the woman leads, but is lonely
O + AB = a fantasy, dream-like couple

AB + A = they come close easily, but there’s a high likelihood of fights
AB + B = they complement each other, but some troubles along the way
AB + O = the best partner, but some concern for sudden clashes
AB + AB = they are on the same wavelength like a friend; energetic couple

Read more at Atlas Obscura: The Positive and Negative Sides of Japan’s Obsession with Dating by Blood Type.

Note: Compatibility equations are taken from this blog post.